Comment by wren6991

RISC-V code density is pretty good these days with Zcmp (push, pop, compressed double move) and Zcb (compressed mul, sign/zero-extend, byte load/store). There is also Zcmt but it's kind of cursed. Hopefully density will keep improving once mainstream compilers have full support for Zilsd/Zclsd (load/store pair for RV32).

T32 is a pretty good encoding but far from perfect. If they had the chance to redo it I doubt they would spend a full 1/32nd of the encoding space on asrs, for example.